From: Tang Chen <tangchen@xxxxxxxxxxxxxx>
acpi_install_notify_handler() could fail. So check the exit status
and give a better debug info.
Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
drivers/acpi/pci_root.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 3ce5d80..f3ceb61 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -762,6 +762,7 @@ static void handle_hotplug_event_root(acpi_handle handle, u32 type,
static acpi_status __init
find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
+ acpi_status status;
char objname[64];
struct acpi_buffer buffer = { .length = sizeof(objname),
.pointer = objname };
@@ -774,9 +775,14 @@ find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
- acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
- handle_hotplug_event_root, NULL);
- printk(KERN_DEBUG "acpi root: %s notify handler installed\n", objname);
+ status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ handle_hotplug_event_root, NULL);
+ if (ACPI_FAILURE(status))
+ printk(KERN_DEBUG "acpi root: %s notify handler is not installed, exit status: %u\n",
+ objname, (unsigned int)status);
+ else
+ printk(KERN_DEBUG "acpi root: %s notify handler is installed\n",
+ objname);
return AE_OK;
}
--
1.7.10.4
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